RCU Forums

RCU Forums (http://www.rcuniverse.com/forum/)
-   Brushed/Brushless motors, speed controls, gear drives (http://www.rcuniverse.com/forum/brushed-brushless-motors-speed-controls-gear-drives-123/)
-   -   bp 12 outrunner (http://www.rcuniverse.com/forum/brushed-brushless-motors-speed-controls-gear-drives-123/2692093-bp-12-outrunner.html)

CRAZYFLY 02-23-2005 05:05 PM

bp 12 outrunner
 
I HAVE 2 LIPOLY BATTERIES 1 1050 MAH 3S AND 1 2S 2100 MAH ILL BE USING A 18A ESC AND A BP 12 OUTRUNNER MOTOR ANYBODY KNOW WHAT KIND OF PERFORMANCE I WILL BE GETTING WITH MY EQUIPTMENT.

Matt Kirsch 02-23-2005 05:28 PM

RE: bp 12 outrunner
 
More importantly, what's a "bp 12 outrunner?"

Also, what prop? Without a prop, you'll get ZERO performance...:(

bp2005 02-24-2005 06:52 AM

RE: bp 12 outrunner
 
Crazyfly: The specs are on Balsa Products web site, Do a serch for BP-12 and the motor specs are on that
page. Voltage, amp draw and prop size. www.balsapr.com Bob

CRAZYFLY 02-24-2005 09:07 AM

RE: bp 12 outrunner
 
BP2005 THANKS FOR YOUR REPLY I HOOKED IT UP LAST KNIGHT BUT DID NOT FLY IT HOLDING THE PLANE IN MY HAND IT DID NOT FEEL LIKE THRUST WITH A 8040 PROP

Matt Kirsch 02-24-2005 10:48 AM

RE: bp 12 outrunner
 
I would expect as much.

To be able to handle the current that the motor wants with an 8x4 prop (9.6 Amps), your 1050mAh 3S pack would need to be rated for 10C. It probably isn't, and can't handle the Amps.

The 2S 2100mAh pack only has 2/3 the voltage of a 3S pack. 2/3 the voltage means 2/3 the current, and only 4/9 of the power.

No wonder the performance isn't that impressive.... You need a better battery.

BTW, please check your caps lock key. ALL CAPS is considered shouting, and is difficult to read.

CRAZYFLY 02-24-2005 04:31 PM

RE: bp 12 outrunner
 
sorry about that new to this whole thing what kind of set up would you recommend for this?

ghee-grose 03-02-2005 12:23 PM

RE: bp 12 outrunner
 
I just bought a BP-12 and an Etec 700 3-cell. I'm going to us a CC Phoenix 25 off of my 3DX. I'm putting all this on a new Yak ShockFlyer from Ikarus. The plane is supposed to get here in a few days. I will let you know how well it does. :D

CRAZYFLY 03-02-2005 03:17 PM

RE: bp 12 outrunner
 
Thank you for your reply im interested in finding out how you do.I was at a hobby show and spoke to somebody at balsa products and they said that some engines were wound backwards from the factory and just to return it.

ghee-grose 03-02-2005 03:25 PM

RE: bp 12 outrunner
 
Couldn't you just swap the motor wires to fix that? (reverse direction)

CRAZYFLY 03-03-2005 01:31 PM

RE: bp 12 outrunner
 
im not to sure about switching the wires but they told me to return it

ghee-grose 03-03-2005 01:35 PM

RE: bp 12 outrunner
 
I think with brushless motors that you hook up the 3 wires in any order, it doesn't matter the color order. If it's rotating the wrong direction, just swap 2 of them. I might be wrong, but I might be right. :)

CRAZYFLY 03-03-2005 02:41 PM

RE: bp 12 outrunner
 
I know that you are right with that but i think it might be deeper than that[:-]

ghee-grose 03-03-2005 02:48 PM

RE: bp 12 outrunner
 
Oh....maybe I took "wound backwards" for running backwards? I hope mine ain't screwed up. Did you try to hook yours up? Did it not run, or just ran like crap?

thatovalguy 03-03-2005 09:14 PM

RE: bp 12 outrunner
 
Crazy if your the guy at the WRAM show what I told you was something totally differant. If you don't have thrust and it doesn't pull the amps than it might have been wound wrong and you could send it back for me to test.

geoffbeneze 03-04-2005 12:07 AM

RE: bp 12 outrunner
 


ORIGINAL: CRAZYFLY

I HAVE 2 LIPOLY BATTERIES 1 1050 MAH 3S AND 1 2S 2100 MAH ILL BE USING A 18A ESC AND A BP 12 OUTRUNNER MOTOR ANYBODY KNOW WHAT KIND OF PERFORMANCE I WILL BE GETTING WITH MY EQUIPTMENT.
until you put load on them, the batteries are largely meaningless. Gotta get the prop on there to get osme idea of what amperage load the thing will draw.

This evening I've been messing with the BP 12 with ESC that just arrived. Fundamentally, my results follow near exactly the charts presented by Balsa Products.

Using a 9.6v, 1000 ma pack the following data:

7x6" prop
8.5 a
67 w
12 oz thrust

8x4 prop
9.1 a
82 w
18 oz thrust

8x6 prop (speed electric)
12 a
100 w
18 oz thrust

9x7 prop (very flexy electric)
15 a
115 w
16 thrust (?_

My "thrust cart" is pretty crude, but it's worked for many years. A small wheeled cart with a more or less universal motor mount. Batteries, meters, Rx, etc all mounted on the cart - foam wheels on the cart. Got a sorta hyena look with the front haunches taller than the rear. Use a precision rifle trigger scale to take the thrust value.


ghee-grose 03-04-2005 08:07 AM

RE: bp 12 outrunner
 
Let's see a picture of that "thrust cart". Sounds like a neat little home-build!

geoffbeneze 03-04-2005 01:52 PM

RE: bp 12 outrunner
 
1 Attachment(s)

ORIGINAL: ghee-grose

Let's see a picture of that "thrust cart". Sounds like a neat little home-build!
That much I can arrange!

I made this in the last 80's when I thought I was starving, but building was WAY more important than eating (G).

The "head" is designed so I could clamp a variety of different motor/styles/mounts into the holder and leave PLENTY of room for prop sizes.

The base of the unit is a bit short, so it takes some careful nursing when the thrust is up.

All int all, it's done the job nicely for me (albeit with a bit of messing around). Moreover, it's been CONSISTENT in my readings, which is more important to my needs that absolute accuracy.

ghee-grose 03-04-2005 01:56 PM

RE: bp 12 outrunner
 
Nice design! I'm sure it has, and will continue to serve its purpose well. :) Thanks for the pics.

geoffbeneze 03-04-2005 02:39 PM

RE: bp 12 outrunner
 


ORIGINAL: ghee-grose

Nice design! I'm sure it has, and will continue to serve its purpose well. :) Thanks for the pics.
There is a lot of Velcro on the cart and parts that doesn't show in the photo. Keeping all that junk secure is important!

I may add a pair of 1 lb lead bars to the very back of the cart to help hold it down when under full thrust.

One of these days I'll design and build a nice ball bearing plate type thrust platform.

ghee-grose 03-08-2005 09:16 AM

RE: bp 12 outrunner
 
1 Attachment(s)
Just a few pics in case anybody needed them....

ghee

ghee-grose 03-08-2005 09:18 AM

RE: bp 12 outrunner
 
1 Attachment(s)
more pics

Woodsy 03-15-2005 06:51 PM

RE: bp 12 outrunner
 
Probably not the way to do it but,
i'll have the BP 21 combos available in Australia in the next week or 2, havent finalised pricing yet as i have to see what the freight comes out like.

check my web site for updates.

dtrocket 03-20-2005 02:24 AM

RE: bp 12 outrunner
 
Hi all, I just bought a BP12 from Balsa Products last weekend at the Lebanon RC flea market.
This is my first brushless motor. My question is - is it ok to soder the leads to the motor & ESC?
I thought I read an artical in a magazine that said sodering would harm the ESC. It looks like
geoffbeneze sodered the leads on the motor on the thrust cart.

geoffbeneze 03-20-2005 02:37 AM

RE: bp 12 outrunner
 


ORIGINAL: dtrocket

Hi all, I just bought a BP12 from Balsa Products last weekend at the Lebanon RC flea market.
This is my first brushless motor. My question is - is it ok to soder the leads to the motor & ESC?
I thought I read an artical in a magazine that said sodering would harm the ESC. It looks like
geoffbeneze sodered the leads on the motor on the thrust cart.
A good, clean (and properly done) soldier job is preferable to connections. No corrosion, no pulling apart, no vibration problems, etc.

The reason one hears NOT to soldier is that a badly "performed" soldiering job can transfer a huge amount of heat into the ESC. Heat is, as we all know, an enemy of electronics.

To do such a job "properly" you want to cut, twist and tin the wire ends for both your ESC and motor. This done, and the now ready to soldier ends held properly in position (hemostats, allegator clips, spouses, kids, etc, etc). It's only a matter of touching the heat to the joint for 2-3 seconds, then removing the solding iron and allowing the joint to cool off.

dtrocket 03-20-2005 02:53 AM

RE: bp 12 outrunner
 
Thanks for the quick response jeoffbeneze :D
Now I can stop looking for that artical.


All times are GMT -8. The time now is 05:19 PM.


Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.